[MITgcm-support] Convert data in latlon grid to cube-sphere grid

[Dimitris Menemenlis]

Yuan, in MITgcm/utils/matlab/cs_grid there is a bunch of matlab  
functions that are specific to cube-sphere grid.  In particular,  
uvLatLon2cube.m will convert vectors from a lat/lon grid to cube sphere.

For surface forcing fields, I suggest that you use exf_interp for on- 
the-fly interpolation.  An example is in MITgcm_contrib/high_res_cube/ 
README.cs32
I use bi-cubic interpolation for vector fields to avoid artifacts in  
the gradients and bi-linear for everything else to avoid spurious  
negative values.

D.

On Dec 23, 2008, at 5:09 AM, Yuan Lian wrote:

> Hi Dimitris,
>
> I talked a little about this with Jean-Michel during AGU. I went to  
> check your poster but you had left.
> Anyway, I do need to convert the vector field as well. For example,  
> I want to use wind field from
> observation data as initial condition. Will the bilinear  
> interpolation cause any trouble here (e.g. cell centered
> to a standard C-grid)? I am thinking about making some matlab  
> scripts to do the trick. Any hint here?
> Thanks a lot for your help!
>
> Cheers,
> Yuan
>
> Dimitris Menemenlis wrote:
>> Yuan, did anybody get back to you?  Going from latlon to cube  
>> sphere for a scalar field is easy.  You can just use bilinear  
>> interpolation, for example, function "interp2" in matlab.  For  
>> vector fields it's a bit trickier but MITgcm can do that on the  
>> fly.  Dimitris
>>
>> On Dec 3, 2008, at 7:17 PM, Yuan Lian wrote:
>>
>>> Hi,
>>>
>>> I am trying to generate topography files in cube-sphere grid. The  
>>> original data
>>> is in latlon grid. More generally, is there anyway I can convert  
>>> the data in latlon grid to
>>> cube-sphere grid? Are there any Matlab scripts available? Thanks!
>>>
>>> Regards,
>>> Yuan
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>>
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